A mixer of the rotor-stator type that includes a stator having aplurality of openings and a rotor disposed on the inner side of the stator andspaced by a predetermined gap away from the stator is described, whereinthe mixer that is capable of improving the shearing stress applied upon theliquid being processed and provides the higher performance is proposed,more specifically, the mixer that allows the shearing stress applied upon theliquid being processed to be changed and adjusted accordingly or allows theflow rate in which the liquid being processed flows to be changed andadjusted accordingly is proposed.The stator includes a plurality of stators each having a differentcircumferential diameter, and the rotor is disposed on the inner side of theplurality of stators and spaced by the predetermined gap away from thestators so that the stators and the rotor can be brought closer to or fartheraway from each other in the direction in which the rotary shaft of the rotorextends
